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Ch. 8 - Microbial Metabolism
Norman-McKay- Microbiology: Basic and Clinical Principles 2nd Edition
Norman-McKay2nd EditionMicrobiology: Basic and Clinical PrinciplesISBN: 9780137661619당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Norman-McKay 2nd EditionCh. 8 - Microbial Metabolism문제 14
8장, 문제 14

Use this pathway schematic to answer questions a through d.
Schematic pathway showing enzymes 1-4 acting on substrates with ATP/ADP and NAD+/NADH conversions along a vertical arrow.
a. Which enzyme carries out a redox reaction? In this reaction, what is being reduced and what is being oxidized?
b. Which enzyme would be the most likely to be regulated by feedback inhibition?
c. What is the end product of this pathway?
d. Which enzyme carries out substrate-level phosphorylation?

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Step 1: Identify the enzyme that catalyzes a redox reaction by looking for the step where electrons are transferred between molecules. Redox reactions involve one molecule being oxidized (losing electrons) and another being reduced (gaining electrons). Determine which enzyme facilitates this electron transfer and specify the substrate that is oxidized and the one that is reduced in this step.
Step 2: To find the enzyme most likely regulated by feedback inhibition, look for the enzyme that catalyzes the first committed step of the pathway or an early step. Feedback inhibition typically occurs when the end product of the pathway binds to this enzyme to decrease its activity, preventing overproduction of the product.
Step 3: Identify the end product of the pathway by following the sequence of reactions from the initial substrate through each enzymatic step until the final product is formed. This is usually the molecule that accumulates and can regulate the pathway.
Step 4: Determine which enzyme carries out substrate-level phosphorylation by identifying the step where a high-energy phosphate group is directly transferred to ADP (or another nucleotide diphosphate) to form ATP (or another nucleotide triphosphate). This is distinct from oxidative phosphorylation and involves a direct enzymatic transfer.
Step 5: Summarize your findings by clearly naming each enzyme corresponding to the questions (a through d) and describing the role or reaction it catalyzes, ensuring you connect the biochemical concepts of redox reactions, feedback inhibition, pathway end products, and substrate-level phosphorylation.

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주요 개념

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Redox Reactions in Enzymatic Pathways

Redox reactions involve the transfer of electrons between molecules, where one molecule is oxidized (loses electrons) and another is reduced (gains electrons). Enzymes that catalyze these reactions facilitate energy transfer and metabolic processes, often involving cofactors like NAD+/NADH.
추천 영상:
가이드 코스
04:47
Redox Reactions

Feedback Inhibition in Metabolic Regulation

Feedback inhibition is a regulatory mechanism where the end product of a metabolic pathway binds to an enzyme, usually the first committed step, to inhibit its activity. This prevents overproduction of the product and maintains metabolic balance.
추천 영상:
가이드 코스
02:41
Negative Feedback

Substrate-Level Phosphorylation

Substrate-level phosphorylation is a process where a phosphate group is directly transferred from a phosphorylated substrate to ADP, forming ATP. This reaction is catalyzed by specific enzymes and occurs independently of the electron transport chain.
추천 영상:
가이드 코스
03:00
Substrate-Level Phosphorylation
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교과서 질문

Rank the following from the most ATP that could be made to the least ATP that could be made:

a. 1 glucose molecule processed via a fermentation pathway (consider that glycolysis is the first stage of the process)

b. A lipid made of glycerol and three 10-carbon fatty acid chains entering cellular respiration

c. 1 glucose molecule entering the Entner–Doudoroff pathway

d. 1 glucose molecule entering cellular respiration

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The photo shows an organism growing in glucose fermentation broth. What can you conclude about this specimen with regard to its ability (or lack thereof) to ferment the sugar sucrose? Explain your answer.

<IMAGE>

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교과서 질문

Match the term to the statement. (Some terms will be used more than once.)

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_______________________ is a process that uses energy from nutrients to fuel an electron transport chain to make ATP.

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